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Earnings per Unit (Tables)
 9 Months Ended
Sep. 30, 2015
Earnings Per Unit [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The calculation of net income per unit for the three and nine months ended September 30, 2015 and 2014, respectively, is as follows:
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2015
 
2014
 
2015
 
2014
 
(In thousands, except per unit data)
Net income
$
16,493

 
$
16,250

 
$
47,731

 
$
49,634

Net income attributable to General Partner (1)
—

 
3,985

 
—

 
15,461

Net income attributable to limited partners
16,493

 
12,265

 
47,731

 
34,173

General Partner distributions
(326
)
 
—

 
(481
)
 
—

Limited partners' distributions on common units
(8,766
)
 
(7,014
)
 
(25,086
)
 
(19,291
)
Limited partners' distributions on subordinated units
(8,326
)
 
(7,014
)
 
(23,838
)
 
(19,291
)
 Distributions less than (greater than) earnings
$
(925
)
 
$
(1,763
)
 
$
(1,674
)
 
$
(4,409
)
 
 
 
 
 
 
 
 
General Partners' earnings:
 
 
 
 
 
 
 
Distributions
$
326

 
$
—

 
$
481

 
$
—

Net income attributable to General Partner (1)
—

 
3,985

 
—

 
15,461

 Total General Partners' earnings
$
326

 
$
3,985

 
$
481

 
$
15,461

 
 
 
 
 
 
 
 
Limited partners' earnings on common units:
 
 
 
 
 
 
 
Distributions
$
8,766

 
$
7,014

 
$
25,086

 
$
19,291

Allocation of distributions less than (greater than) earnings
(474
)
 
(882
)
 
(858
)
 
(2,205
)
 Total limited partners' earnings on common units
$
8,292

 
$
6,132

 
$
24,228

 
$
17,086

 
 
 
 
 
 
 
 
Limited partners' earnings on subordinated units:
 
 
 
 
 
 
 
Distributions
$
8,326

 
$
7,014

 
$
23,838

 
$
19,291

Allocation of distributions less than (greater than) earnings
(451
)
 
(881
)
 
(816
)
 
(2,204
)
 Total limited partners' earnings on subordinated units
$
7,875

 
$
6,133

 
$
23,022

 
$
17,087

 
 
 
 
 
 
 
 
Weighted-average limited partner units outstanding:
 
 
 
 
 
 
 
 Common units - basic
24,017

 
22,811

 
24,006

 
22,811

 Common units - diluted
24,024

 
22,883

 
24,024

 
22,853

 Subordinated units - basic and diluted
22,811

 
22,811

 
22,811

 
22,811

 
 
 
 
 
 
 
 
Net income per limited partner unit:
 
 
 
 
 
 
 
 Common - basic
$
0.35

 
$
0.27

 
$
1.01

 
$
0.75

 Common - diluted
0.35

 
0.27

 
1.01

 
0.75

 Subordinated - basic and diluted
0.35

 
0.27

 
1.01

 
0.75

(1)
For historical periods prior to the Wholesale Acquisition, we have applied the two-class method to calculate earnings per unit. The net income of WRW prior to the Wholesale Acquisition was allocated entirely to the General Partner.